Hittite history

...to Dattassa, a city somewhere in the Taurus area, and he assigned the government of his northern provinces to his brother Hattusilis. When Muwatallis died and was succeeded by his son, Urhi-Teshub (
Mursilis III), the boy’s uncle became a rival to the throne and, after a seven-year quarrel, forced him into exile in Syria.

Muwatallis’ successor

...north (the only troublesome Hittite satellite during Muwatallis’ reign) and was installed as viceroy of the “Upper Country” east of Hattusas. Later, after Muwatallis’ son, Urhi-Teshub (
Mursilis III), succeeded him, Hattusilis revolted and seized the throne.